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Related Concept Videos

Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

3.7K
Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
3.7K
Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

7.9K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
7.9K
Nomenclature of Aryl and Heterocyclic Amines01:10

Nomenclature of Aryl and Heterocyclic Amines

3.0K
The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.
3.0K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

7.2K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
7.2K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.2K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.2K
Electrophilic Aromatic Substitution: Overview01:16

Electrophilic Aromatic Substitution: Overview

13.3K
In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.
13.3K

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Related Experiment Videos

Structure-anorectic activity relationships in substituted phenethylamines.

S L Beregi, J Duhault

    Arzneimittel-Forschung
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Phenylisopropylamine derivatives were studied for anorectic activity. Unlike amphetamine, beta-methoxy and beta-hydroxy variants lacked this effect, which reappeared with a CF3 group or N-alkylation.

    Related Experiment Videos

    Area of Science:

    • Pharmacology
    • Medicinal Chemistry

    Background:

    • Phenylisopropylamine derivatives are known for various biological activities.
    • Structure-activity relationships are crucial for drug development.

    Purpose of the Study:

    • To investigate the anorectic potential of phenylisopropylamine derivatives.
    • To compare the activity of beta-methoxy- and beta-hydroxy-phenethylamine analogs.
    • To explore the impact of specific chemical modifications on anorectic effects.

    Main Methods:

    • Synthesis and pharmacological evaluation of phenylisopropylamine derivatives.
    • Comparison with beta-methoxy- and beta-hydroxy-phenethylamine compounds.
    • Assessment of anorectic activity in relation to chemical structure.

    Main Results:

    • Beta-methoxy phenethylamine derivatives showed no anorectic activity, unlike amphetamine.
    • Anorectic activity was restored upon introduction of a trifluoromethyl (CF3) group on the benzene ring.
    • Racemic N-alkyl derivatives exhibited greater activity than racemic or levorotatory N-benzyl compounds.
    • Beta-hydroxy-phenethylamines were found to be devoid of anorectic activity.

    Conclusions:

    • The presence of a beta-methoxy or beta-hydroxy group significantly reduces or eliminates anorectic activity.
    • Specific structural features, such as a CF3 group or N-alkylation, are critical for conferring anorectic properties in these compounds.